Have 3 road bikes and all are pretty well sorted now so no problems but I am wondering what you have changed on your "Newly Purchased" bike that was not suitable for your use.
When I got the Boreas it was a custom build and I specced everything on it with a bit of help from the LBS. Other than the saddle that I did eventually change- it has stayed with all the original parts as bought. The Giant TCR-c was similar in that I fitted all the parts from a TCR3 onto a light weight frame the shop had and just changed the Crank to a compact and the Wheels to Mavic Aksiums. The wheels were a mistake and took a long time to find out about. Once the handbuilt wheels went on- the bike settled down. Since changed the crankset to a triple as this has turned into the Long rides or Hilly ride bike and a Century with hills did get a bit tiring by the end- even with a compact crank.
Last bike was a Pinarrelo FP UNO and is the cheapest of the Race Geometry bikes from them. not a cheap bike compared to the Usual big name ones being fitted with a complete Tiagra groupset other than the brifters that are 105 and the wheels that are Shimano R500's. This a downgrade from the mix of 105/Ultegra that I have on the other two but is the 2012 version that is an improvement on previous years. The brifters are Noticable but I did have my doubts about the wheels. Weight is a bit high at 17.5lbs compared to Boreas and the TCR but this is for a different use. It is the runaround bike when speed or hills or LONG distance is not involved. Only had it a couple of months and is a superb ride. Only one thing changed and that is the tyres. The OM's fitted were puncture prone so now have My favourite brand of Michelin Pro Race fitted and this has also improved the ride. Only problem with the bike is it is white and this has been made worse by fitting white tyres to it
So what have you changed on your bike(s) from the original spec that were not up to your standards?